您需要创建一个自定义列表视图渲染器并在其上应用自定义样式。
创建一个派生的 ListView:
namespace MyApp.Controls
{
public class MyListView : Xamarin.Forms.ListView
{
}
}
在您的视图中将 ListView 更改为您的派生控件:
<?xml version="1.0" encoding="utf-8" ?>
<ContentView
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:MyApp.Controls"
x:Class="MyApp.MyView">
<controls:MyListView
ItemsSource="{Binding ListSource}"
SelectionMode="None"
SeparatorVisibility="None">
// ...
// template
// ..
</controls:CustomListView>
</ContentView>
在你的 UWP 项目中创建一个列表视图渲染:
[assembly: ExportRenderer(typeof(MyListView), typeof(MyListViewRenderer))]
namespace MyApp
{
class MyListViewRenderer : ListViewRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if (Control is Windows.UI.Xaml.Controls.ListView listView)
{
listView.ItemContainerStyle = (Windows.UI.Xaml.Style)MyApp.App.Current.Resources["CustomListViewItem"];
}
}
}
}
现在您需要定义上面的 CustomListViewItem 样式。
windows 控件的默认样式在 generic.xaml 文件中定义,可以在以下本地路径中找到:
C:\Program Files (x86)\Windows Kits\10\DesignTime\CommonConfiguration\Neutral\UAP\10.0.18362.0\Generic
在其中你会找到默认的列表视图项样式,称为 ListViewItemExpanded,你需要修改它的样式并将其加载到资源字典中。
这是一个没有动画的缩短版本(保存到 CustomListViewItem.xaml):
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
<Style x:Key="CustomListViewItem" TargetType="ListViewItem">
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
<Setter Property="BorderBrush" Value="{x:Null}" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}" />
<Setter Property="TabNavigation" Value="Local" />
<Setter Property="IsHoldingEnabled" Value="True" />
<Setter Property="Padding" Value="0,0,0,0" />
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="MinWidth" Value="{ThemeResource ListViewItemMinWidth}" />
<Setter Property="MinHeight" Value="{ThemeResource ListViewItemMinHeight}" />
<Setter Property="AllowDrop" Value="False" />
<Setter Property="UseSystemFocusVisuals" Value="{StaticResource UseSystemFocusVisuals}" />
<Setter Property="FocusVisualMargin" Value="0" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListViewItem">
<Grid x:Name="ContentBorder"
Control.IsTemplateFocusTarget="True"
FocusVisualMargin="{TemplateBinding FocusVisualMargin}"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
CornerRadius="{TemplateBinding CornerRadius}"
RenderTransformOrigin="0.5,0.5">
<Grid.RenderTransform>
<ScaleTransform x:Name="ContentBorderScale" />
</Grid.RenderTransform>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
<Storyboard>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOver">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListMediumBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<!--<PointerDownThemeAnimation TargetName="ContentPresenter" />-->
</Storyboard>
</VisualState>
<VisualState x:Name="Selected">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="MultiSelectCheck"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0"
To="1" />
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOverSelected">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="MultiSelectCheck"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0"
To="1" />
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentMediumBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="PressedSelected">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="MultiSelectCheck"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0"
To="1" />
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerDownThemeAnimation TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="DisabledStates">
<VisualState x:Name="Enabled" />
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="ContentBorder"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="{ThemeResource ListViewItemDisabledThemeOpacity}" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="MultiSelectStates">
<VisualState x:Name="MultiSelectDisabled">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheckBoxTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="0" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="-32" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectClipTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="0" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="32" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenterTranslateTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible" />
<DiscreteObjectKeyFrame KeyTime="0:0:0.333" Value="Collapsed" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="MultiSelectEnabled">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheckBoxTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="-32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectClipTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenterTranslateTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="-32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenterGrid" Storyboard.TargetProperty="Margin">
<DiscreteObjectKeyFrame KeyTime="0" Value="32,0,0,0" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="BorderBackground"
IsHitTestVisible="False"
Fill="{ThemeResource SystemControlHighlightListAccentLowBrush}"
Opacity="0"
Control.IsTemplateFocusTarget="True" />
<Grid x:Name="ContentPresenterGrid" Background="Transparent" Margin="0,0,0,0">
<Grid.RenderTransform>
<TranslateTransform x:Name="ContentPresenterTranslateTransform" />
</Grid.RenderTransform>
<ContentPresenter x:Name="ContentPresenter"
ContentTransitions="{TemplateBinding ContentTransitions}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
Margin="{TemplateBinding Padding}" />
</Grid>
<!-- The 'Xg' text simulates the amount of space one line of text will occupy.
In the DataPlaceholder state, the Content is not loaded yet so we
approximate the size of the item using placeholder text. -->
<TextBlock x:Name="PlaceholderTextBlock"
Opacity="0"
Text="Xg"
Foreground="{x:Null}"
Margin="{TemplateBinding Padding}"
IsHitTestVisible="False"
AutomationProperties.AccessibilityView="Raw" />
<Rectangle x:Name="PlaceholderRect" Visibility="Collapsed" Fill="{ThemeResource ListViewItemPlaceholderBackground}" />
<Border x:Name="MultiSelectSquare"
BorderBrush="{ThemeResource SystemControlForegroundBaseMediumHighBrush}"
BorderThickness="2"
Width="20"
Height="20"
Margin="12,0,0,0"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Visibility="Collapsed">
<Border.Clip>
<RectangleGeometry Rect="0,0,20,20">
<RectangleGeometry.Transform>
<TranslateTransform x:Name="MultiSelectClipTransform" />
</RectangleGeometry.Transform>
</RectangleGeometry>
</Border.Clip>
<Border.RenderTransform>
<TranslateTransform x:Name="MultiSelectCheckBoxTransform" />
</Border.RenderTransform>
<FontIcon x:Name="MultiSelectCheck"
FontFamily="{ThemeResource SymbolThemeFontFamily}"
Glyph=""
FontSize="16"
Foreground="{ThemeResource SystemControlForegroundBaseMediumHighBrush}"
Visibility="Collapsed"
Opacity="0" />
</Border>
<Border x:Name="MultiArrangeOverlayTextBorder"
Opacity="0"
IsHitTestVisible="False"
Margin="12,0,0,0"
MinWidth="20"
Height="20"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Background="{ThemeResource SystemControlBackgroundAccentBrush}"
BorderThickness="2"
BorderBrush="{ThemeResource SystemControlBackgroundChromeWhiteBrush}">
<TextBlock x:Name="MultiArrangeOverlayText"
Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.DragItemsCount}"
Style="{ThemeResource CaptionTextBlockStyle}"
IsHitTestVisible="False"
Opacity="0"
VerticalAlignment="Center"
HorizontalAlignment="Center"
AutomationProperties.AccessibilityView="Raw" />
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
注意<PointerDownThemeAnimation TargetName="ContentPresenter" /> 在按下的视觉状态下被注释掉了。
现在将该资源加载到您的应用中:
<Application
x:Class="MyApp.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Styles/CustomListViewItem.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
您可能需要进一步调整样式,但基本上就是这样。
顺便说一句,同样的方法可用于调整 UWP 中任何本机控件的外观。